Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125

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Aquastar on demand gas water heater wont light just sparks til it times out. Have gas to the unit so what next???

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Replace the flame sensor

Posted on Sep 14, 2009

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How to light the pilot light in a bosch aquastar 125 fx ng tankless water heater


I have the same machine first they said replace the micro switch i did then rebuild the water valve did not enough gas presure had it checked revented the unit the unit is brandnew relubed the water valve idk

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Failing ignition on Bosch Aquastar AQ125-HX tankless on demand water heater. Carefully followed all directions on device to best of ability. Gas supply is full and on. Water pressure should be...


Before calling service technician, open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Resources at Bosch
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/tabid/370/Default.aspx
Typical Bosch Aquastar manual:
http://waterheatertimer.org/pdf/Bosch-aquastar-170vp-manual.pdf

All tankless and tank-type gas water heaters require regular cleaning and maintenance.
It is unknown if your unit needs maintenance or repair parts, but catching up on maintenance using information from manual is good place to start.
Gas appliances are increasingly complicated and experienced technician is good resource to have in local area before installing tankless.

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Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater. Problems with constant hot water. The heater turns ok but (i think) when i turn on the cold side the heater stops. at...


Possible flow sensor issue. Check to see if your water pressure fluctuates a lot or is fairly steady. These units are sensitive to the pressure. take care.

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1 Answer

Bosch on demand tankless water heater gwh 2400 E LP error code "


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Bosch tankless GWH 1600 H NG won't always ignite. The igniter sparks, but doesn't always light the gas. It just clicks. When installed it lit every time, now it takes more and more tries to get it to...


The manual says to hold a match near the pilot while the ignitor is trying. It says that if the unit lights the pilot orifice may be dirty or clogged. Then the manual says to check the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.

Let me know the status ...Kevin

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1 Answer

Bosch 1600H NG


I hope this helps!
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/1600HTechSupport/Troubleshoot/tabid/1094/Default.aspx
Copy and paste to google search engine!

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2 Answers

Tankless water heater pilot light will not stay on


It is most likely the water valve stuck open, telling the controls to heat water, that it thinks is flowing through it, but without actual flow it overheats. Depending on how comfortable you are with taking it apart yourself, you could open the valve to see if it just needs cleaned out, or if you have a ruptured diaphragm or some other cause.

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